CN114326026B

CN114326026B - Optical lens, camera module and electronic equipment

Info

Publication number: CN114326026B
Application number: CN202111632236.3A
Authority: CN
Inventors: 张洛彬; 华露; 杨健; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2023-09-05
Anticipated expiration: 2041-12-29
Also published as: CN114326026A

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises the following components in sequence from an object side to an image side along an optical axis: the first lens element with positive refractive power has a convex object-side surface at a paraxial region; a second lens element with negative refractive power having a concave image-side surface at a paraxial region; a third lens element with refractive power; a fourth lens element with refractive power having a convex image-side surface at a paraxial region; the image side surface of the fifth lens element with refractive power is concave at a paraxial region, and the object side surface and the image side surface of the fifth lens element are aspheric, and at least one of the object side surface and the image side surface is provided with at least two inflection points; the optical lens satisfies the following relation: 0.3< f12/f345<0.75. The optical lens, the camera module and the electronic equipment provided by the invention can realize the miniaturization and the light weight of the optical lens and have the characteristic of high imaging quality.

Description

Optical lens, camera module and electronic equipment

Technical Field

The present invention relates to the field of optical imaging technologies, and in particular, to an optical lens, a camera module, and an electronic device.

Background

With the progress and development of the age, the requirements of the modern society on the camera shooting capability of electronic equipment are higher and higher. On the one hand, with the continuous progress of the semiconductor manufacturing process, the performance of the photosensitive element is continuously improved, and the pixel size can reach a smaller size, so that the requirement on the imaging quality of the optical lens is also higher and higher. On the other hand, electronic devices such as smart phones in the market show a trend of miniaturization and thinness, which requires that the optical lens has to meet the requirement of high imaging quality and also has a design of miniaturization and lightness, so that space is saved for other components.

Therefore, how to configure parameters such as the number of lenses and the surface shape of the optical lens, so that the lens can achieve miniaturization and light weight, and obtain better imaging quality as much as possible, is a problem to be solved.

Disclosure of Invention

The embodiment of the invention discloses an optical lens, an imaging module and electronic equipment, which can realize the miniaturization and the light weight of the optical lens and have the characteristic of high imaging quality.

In order to achieve the above object, in one aspect, the present invention discloses an optical lens, including, in order from an object side to an image side along an optical axis:

a first lens element with positive refractive power having a convex object-side surface at a paraxial region;

a second lens element with negative refractive power having a concave image-side surface at a paraxial region;

a third lens element with refractive power;

a fourth lens element with refractive power having a convex image-side surface at a paraxial region;

the image side surface of the fifth lens element with refractive power is concave at a paraxial region, the object side surface and the image side surface of the fifth lens element are aspheric, and at least one of the object side surface and the image side surface of the fifth lens element is provided with at least two inflection points;

The optical lens satisfies the following relation:

0.3<f12/f345<0.75；

wherein f12 is a combined focal length of the first lens and the second lens, and f345 is a combined focal length of the third lens, the fourth lens, and the fifth lens.

By defining the first lens element and the second lens element of the optical lens element to have positive refractive power and negative refractive power, respectively, light rays with a small angle can be stably converged into the optical lens element, and the possibility of aberration generation can be reduced; the surface design of matching the convex object side surface of the first lens element at the paraxial region and the concave image side surface of the second lens element at the paraxial region is beneficial to enhancing the positive refractive power of the first lens element, enabling light rays to be better converged and improving the optical performance of the optical lens element; the image side surface of the fourth lens element is convex at a paraxial region, which is advantageous for correcting coma aberration of the optical lens element, so as to improve the resolution of imaging of the optical lens element. When light rays are incident into the fifth lens, the concave surface type arrangement of the image side surface of the fifth lens at the paraxial region can ensure the imaging range of the optical lens and simultaneously avoid the overlarge outer diameter of the lens of the fifth lens, thereby realizing the miniaturization of the optical lens. And the fifth lens element provides positive refractive power or negative refractive power for the optical lens element, so that when incident light enters the imaging surface of the optical lens element through the fifth lens element, the fifth lens element can balance the aberration, which is generated by the incident light through the front lens element (the first lens element to the fourth lens element) and is difficult to correct, of the optical lens element, thereby improving the aberration balance of the optical lens element and the resolution of the optical lens element, and improving the imaging quality of the optical lens element.

Meanwhile, the object side surface and the image side surface of the fifth lens are spherical, and at least one of the object side surface and the image side surface is provided with at least two inflection points, so that light rays of the edge view field can obtain smaller light ray deflection angles.

In addition, when the optical lens satisfies the above-described relational expression, the refractive power of the combined lens group of the first lens and the second lens, and the combined lens group of the third lens, the fourth lens, and the fifth lens can be reasonably distributed spatially so that the optical lens as a whole reaches an aberration balance, thereby reducing the advanced aberration of the optical lens and improving the imaging quality. When the ratio thereof is higher than the upper limit or lower than the lower limit, the refractive power differences between the combined lens groups of the first lens and the second lens, and the combined lens groups of the third lens, the fourth lens, and the fifth lens are excessively large, so that the aberration of the optical lens is unbalanced, the higher order aberration increases, and the imaging quality of the optical lens is degraded.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:

1.2＜TTL/ImgH<1.35；

Wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis (i.e. the total length of the optical lens), and ImgH is the radius of the maximum effective imaging circle of the optical lens.

The ratio of the total length of the optical lens to the radius of the maximum effective imaging circle of the optical lens is restrained, so that the convergence capacity of the optical lens to incident light rays can be ensured, the imaging range of the optical lens is ensured, the relative brightness of the optical lens is improved, and the imaging quality of the optical lens is further improved; meanwhile, the constraint of the relational expression is beneficial to shortening the total length of the optical lens, so that the optical lens is light, thin and miniaturized. When the ratio is higher than the upper limit, the total length of the optical lens is too long, which is not beneficial to miniaturization of the optical lens; when the ratio thereof is below the lower limit, the imaging range of the optical lens is reduced, so that the imaging quality of the optical lens is affected.

-4.7<CT3/SAG31<-2.4；

Wherein CT3 is the thickness of the third lens element on the optical axis, i.e., the center thickness of the third lens element, SAG31 is the projection of the edge of the object-side optically effective area of the third lens element on the optical axis, and the distance between the object-side surface of the third lens element and the intersection point of the optical axis (i.e., the object-side surface sagittal height of the third lens element).

By controlling the center thickness of the third lens and the object side elevation of the third lens, good conditions can be provided for processing, forming and assembling of the third lens, the problems of high lens processing difficulty and unstable forming quality caused by overlarge elevation of the third lens and the problem of deformation of the assembled lens caused by uneven stress are avoided, and therefore the imaging quality of the optical lens is ensured; meanwhile, by limiting the center thickness of the third lens, the optical lens achieves the design requirement of light and thin design while achieving high imaging quality. When the ratio is higher than the upper limit or lower than the lower limit, the third lens face is difficult to process, and is easily deformed after assembly, resulting in a decrease in imaging quality.

1.7<TTL/ΣCT<2.15；

Wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis (i.e. the total length of the optical lens), Σct is the sum of the thicknesses of the first lens to the fifth lens on the optical axis (i.e. the sum of the thicknesses of the centers of the lenses of the optical lens).

By reasonably controlling the ratio of the total length of the optical lens to the sum of the center thicknesses of the lenses of the optical lens, the space of the optical lens can be effectively utilized, and the total length of the optical lens is reduced, so that the miniaturized design of the optical lens is realized. In addition, when the relation is satisfied, the distance between lenses can be increased, so that tolerance sensitivity is reduced, and quality and stability of the optical lens in production are improved. When the ratio is higher than the upper limit, the total length of the optical lens is too long, which is not beneficial to miniaturization of the optical lens; when the ratio thereof is below the lower limit, the sum of the thicknesses of the centers of the lenses of the optical lens is excessively large, the spatial compactness of the optical lens becomes large, and the distance between the lenses is limited, so that the tolerance sensitivity of the optical lens is affected, so that the imaging quality of the optical lens is deteriorated.

0.8<f/R1-f/R4<1.2；

wherein R1 is a radius of curvature of the object side surface of the first lens element at the optical axis, R4 is a radius of curvature of the image side surface of the second lens element at the optical axis, and f is an effective focal length of the optical lens assembly.

By limiting the ratio of the effective focal length of the optical lens to the difference between the radius of curvature of the object side surface of the first lens at the optical axis and the radius of curvature of the image side surface of the fourth lens at the optical axis, the optical lens can have higher aberration correcting capability, the aberration balance of the optical lens is promoted, the resolution of the optical lens is further improved, and the imaging quality of the optical lens is further improved; in addition, the curvature radius of the first lens and the second lens is controlled, so that the manufacturing and the forming of the first lens and the second lens are facilitated, and the optical lens has the characteristics of better manufacturability and miniaturization. When the ratio is higher than the upper limit, the focal length of the optical lens is too large, which is not beneficial to the miniaturization design of the optical lens; when the ratio is below the lower limit, the aberration correcting ability of the optical lens becomes weak, resulting in a decrease in imaging quality of the optical lens.

TTL/tan(HFOV)<4.6mm；

wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and HFOV is half of the maximum field angle of the optical lens.

By reasonably controlling the ratio, the overall space utilization rate of the optical lens is improved, so that the optical lens has the characteristic of large angle of view and simultaneously is miniaturized. When the ratio is higher than the upper limit, the space utilization rate of the optical lens is reduced, which is unfavorable for the miniaturization design of the optical lens.

2.2<(CT1+CT2+CT3)/(CT12+CT23)<4；

wherein, CT1 is the thickness of the first lens element on the optical axis, i.e., the center thickness of the first lens element, CT2 is the thickness of the second lens element on the optical axis, i.e., the center thickness of the second lens element, CT3 is the thickness of the third lens element on the optical axis, i.e., the center thickness of the third lens element, CT12 is the distance from the image side surface of the first lens element to the object side surface of the second lens element on the optical axis, i.e., the air gap between the first lens element and the second lens element on the optical axis, and CT23 is the distance from the image side surface of the second lens element to the object side surface of the third lens element on the optical axis, i.e., the air gap between the second lens element and the third lens element on the optical axis.

The risk of ghost images can be effectively reduced and the imaging quality of the optical lens can be improved by reasonably adjusting the ratio of the sum of the center thicknesses of the first lens, the second lens and the third lens to the sum of the air gaps of the first lens, the second lens and the third lens; meanwhile, the central thicknesses of the first lens, the second lens and the third lens are favorably controlled, the air gaps of the first lens, the second lens and the third lens are favorably controlled, the total length of the optical lens is controlled, the compactness of the optical lens structure is guaranteed, and the miniaturization of the optical lens is further realized. When the ratio is higher than the upper limit, the risk of ghost images of the optical lens is increased, and the imaging quality of the optical lens is affected; when the ratio is lower than the lower limit, the air gaps of the first lens, the second lens, and the third lens are too large, so that the optical lens is difficult to satisfy a miniaturized design.

1.2<SAG42/SAG41<2.9；

Wherein SAG41 is the distance between the projection of the edge of the object-side optically effective area of the fourth lens on the optical axis and the intersection point of the object-side surface of the fourth lens and the optical axis, that is, the sagittal height of the object-side surface of the fourth lens, and SAG42 is the distance between the projection of the edge of the image-side optically effective area of the fourth lens on the optical axis and the intersection point of the image-side surface of the fourth lens and the optical axis, that is, the sagittal height of the image-side surface of the fourth lens.

By limiting the relational expression, the bending degree of the fourth lens is favorably limited, and the surface type complexity of the fourth lens is reduced, so that the sensitivity of the optical lens is reduced, the production and processing of the fourth lens are favorably realized, and the forming uniformity of the fourth lens is improved; meanwhile, the incident angle of the principal ray is guaranteed, the shooting effect of the incident ray is guaranteed, and the pressure of the fourth lens and the fifth lens on the converging effect of the light ray is reduced, so that the imaging definition of the optical lens is improved, and the imaging quality of the optical lens is improved. When the ratio is higher than the upper limit, the image side vector height of the fourth lens is too large; when the ratio is lower than the lower limit, the object-side sagittal height of the fourth lens is too large, both cases can lead to corresponding surface type complications, and difficulty in lens processing becomes large, so that imaging quality of the optical lens may be affected.

0.6<ET34/SD34<0.95；

wherein ET34 is the distance between the maximum effective half-caliber of the image side of the third lens and the maximum effective half-caliber of the object side of the fourth lens along the optical axis direction, and SD34 is the difference between the maximum effective half-caliber of the image side of the third lens and the maximum effective half-caliber of the object side of the fourth lens in the direction perpendicular to the optical axis.

By limiting the relational expression, the deflection angle of the light rays emitted into the fourth lens by the third lens is reduced, the relative illuminance of an outer view field is improved, the brightness of imaging of the optical lens is improved, and the imaging quality of the optical lens is ensured. Meanwhile, the arrangement compactness of the third lens and the fourth lens can be improved, and the space utilization rate of the optical lens is improved, so that the design requirement of miniaturization of the optical lens is met. When the ratio is higher than the upper limit, the edges of the third lens and the fourth lens are far away from each other, the arrangement of the lenses is loose, the space utilization rate of the optical lens is reduced, and the miniaturization design of the optical lens is not facilitated; when the ratio is lower than the lower limit, the height difference between the edges of the image side surface of the third lens and the object side surface of the fourth lens is too large, so that total reflection is easy to occur, the relative illuminance of the external view field is reduced, and the imaging quality of the optical lens is further affected.

In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes an image sensor and the optical lens according to the first aspect, and the image sensor is disposed on an image side of the optical lens. The camera module with the optical lens can realize high-quality imaging effect while meeting the miniaturization design.

In a third aspect, the invention discloses an electronic device, which comprises a housing and the camera module set in the second aspect, wherein the camera module set is arranged on the housing. The electronic equipment with the camera module can realize high-quality imaging effect while meeting the miniaturization design.

Compared with the prior art, the invention has the beneficial effects that:

according to the optical lens, the image pickup module and the electronic device provided by the embodiment of the invention, the first lens and the second lens of the optical lens respectively have positive refractive power and negative refractive power, so that light rays with small angles can be favorably converged into the optical lens, and meanwhile, the positive refractive power of the first lens is enhanced by matching with the plane design that the object side surface of the first lens is convex at a paraxial region and the image side surface of the second lens is concave at a paraxial region, so that the light rays can be better converged, and the optical performance of the optical lens is improved; the image side surface of the fourth lens element is convex at a paraxial region, which is beneficial to correcting coma aberration of the optical lens element so as to improve the imaging resolution of the optical lens element. When light rays are incident into the fifth lens, the concave surface type arrangement of the image side surface of the fifth lens at the paraxial region can ensure the imaging range of the optical lens and simultaneously avoid the overlarge outer diameter of the lens of the fifth lens, thereby realizing the miniaturization of the optical lens. The fifth lens element provides positive refractive power or negative refractive power for the optical lens element, so that when incident light enters the imaging surface of the optical lens element through the fifth lens element, the fifth lens element can balance the aberration which is generated by the incident light passing through the front lens element (the first lens element to the fourth lens element) and is difficult to correct, and the aberration balance of the lens element is promoted, so that the resolution of the optical lens element is improved, and the imaging quality of the optical lens element is improved.

In addition, the optical lens satisfies 0.3< f12/f345<0.75, so that the refractive powers of the two lens groups are reasonably distributed in space, and the whole optical lens achieves balance among aberration in the whole, thereby reducing advanced aberration and improving imaging quality.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an optical lens disclosed in a first embodiment of the present application;

fig. 2 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens according to the first embodiment of the present application;

FIG. 3 is a schematic view of an optical lens according to a second embodiment of the present application;

fig. 4 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens according to a second embodiment of the present application;

FIG. 5 is a schematic view of an optical lens according to a third embodiment of the present application;

Fig. 6 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens according to a third embodiment of the present application;

fig. 7 is a schematic structural view of an optical lens disclosed in a fourth embodiment of the present application;

fig. 8 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens according to a fourth embodiment of the present application;

fig. 9 is a schematic structural view of an optical lens disclosed in a fifth embodiment of the present application;

fig. 10 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens according to a fifth embodiment of the present application;

fig. 11 is a schematic structural view of an optical lens disclosed in a sixth embodiment of the present application;

fig. 12 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens according to a sixth embodiment of the present application;

fig. 13 is a schematic structural view of an optical lens disclosed in a seventh embodiment of the present application;

fig. 14 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens according to a seventh embodiment of the present application;

fig. 15 is a schematic structural view of an optical lens disclosed in an eighth embodiment of the present application;

fig. 16 is a longitudinal spherical aberration diagram (mm), astigmatic curve diagram (mm) and distortion curve diagram (%) of an optical lens according to an eighth embodiment of the present application;

FIG. 17 is a schematic diagram of a camera module according to the present disclosure;

fig. 18 is a schematic structural view of an electronic device of the present disclosure.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The technical scheme of the application will be further described with reference to the examples and the accompanying drawings.

Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 sequentially disposed from an object side to an image side along an optical axis O; during imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 in sequence from the object side of the first lens L1, and finally is imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, and the third lens element L3, the fourth lens element L4 and the fifth lens element L5 with positive or negative refractive power.

Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is convex or concave at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex or concave at a paraxial region O, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region O; the object-side surface 31 of the third lens element L3 is convex or concave at a paraxial region O, and the image-side surface 32 of the third lens element L3 is convex or concave at the paraxial region O; the object-side surface 41 of the fourth lens element L4 is convex or concave at a paraxial region O, and the image-side surface 42 of the fourth lens element L4 is convex at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is convex or concave at the paraxial region O, the image-side surface 52 of the fifth lens element L5 is concave at the paraxial region O, the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are aspheric, and at least one of the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 has at least two inflection points.

The object-side surface 11 of the first lens element L1 is concave or convex at the circumference, and the image-side surface 12 of the first lens element L1 is concave or convex at the circumference; the object-side surface 21 of the second lens element L2 is convex or concave at the circumference, and the image-side surface 22 of the second lens element L2 is convex or concave at the circumference; the object-side surface 31 of the third lens element L3 is convex or concave at the circumference, and the image-side surface 32 of the third lens element L3 is convex or concave at the circumference; the object-side surface 41 of the fourth lens element L4 is convex or concave at the circumference, and the image-side surface 42 of the fourth lens element L4 is convex or concave at the circumference; the object-side surface 51 of the fifth lens element L5 is convex or concave at the circumference, and the image-side surface 52 of the fifth lens element L5 is convex or concave at the circumference.

By reasonably configuring the surface shape and refractive power of each lens between the first lens L1 to the fifth lens L5, the optical lens 100 can be made to achieve a high-quality imaging effect while satisfying downsizing and weight saving.

Further, in some embodiments, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all plastic, and in this case, the optical lens 100 can reduce the weight and the cost. In other embodiments, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be glass, so that the optical lens 100 has a good optical effect and the temperature sensitivity of the optical lens 100 can be reduced.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be aspheric lenses for easy molding. It is understood that in other embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be spherical lenses.

In some embodiments, the optical lens 100 further includes a stop STO, which may be an aperture stop and/or a field stop, which may be disposed on the object side of the first lens L1. By providing the stop STO on the object side of the first lens L1, the exit pupil can be moved away from the imaging plane 101, and the effective diameter of the optical lens 100 can be reduced without reducing the telecentricity of the optical lens 100, thereby achieving miniaturization. It will be appreciated that in other embodiments, the stop STO may be disposed between other lenses, and the arrangement is adjusted according to the actual situation, which is not particularly limited in this embodiment.

In some embodiments, the optical lens 100 further includes an infrared filter 60, and the infrared filter 60 is disposed between the fifth lens L5 and the imaging surface 101 of the optical lens 100. The infrared filter 60 is selected to filter infrared light, so that imaging is more in line with the visual experience of human eyes, and imaging quality is improved. It is to be understood that the infrared filter 60 may be made of an optical glass coating, or may be made of colored glass, or the infrared filter 60 made of other materials may be selected according to actual needs, and is not particularly limited in this embodiment.

In some embodiments, the optical lens 100 satisfies the following relationship:

0.3<f12/f345<0.75；

wherein f12 is a combined focal length of the first lens L1 and the second lens L2, and f345 is a combined focal length of the third lens L3, the fourth lens L4 and the fifth lens L5.

By defining the above relation, the refractive powers of the combination of the first lens element L1 and the second lens element L2 and the combination of the third lens element L3, the fourth lens element L4 and the fifth lens element L5 can be reasonably spatially distributed, so that the optical lens 100 as a whole achieves an aberration balance, thereby reducing the higher order aberration of the optical lens 100 and improving the imaging quality of the optical lens 100. When the ratio thereof is higher than the upper limit or lower than the lower limit, the refractive power differences between the combined lens groups of the first lens element L1 and the second lens element L2, and the combined lens groups of the third lens element L3, the fourth lens element L4, and the fifth lens element L5 are excessively large, so that the aberration of the optical lens 100 is unbalanced, the higher order aberration increases, and the imaging quality of the optical lens 100 is degraded.

In some embodiments, the optical lens 100 satisfies the following relationship:

1.2＜TTL/ImgH<1.35；

where TTL is the distance between the object side surface 11 of the first lens L1 and the imaging surface 101 on the optical axis O (i.e. the total length of the optical lens 100), and ImgH is the radius of the maximum effective imaging circle of the optical lens 100.

By restricting the ratio of the total length of the optical lens 100 to the radius of the maximum effective imaging circle, the convergence capability of the optical lens 100 to incident light rays can be ensured, the imaging range of the optical lens 100 is ensured, the relative brightness of the optical lens 100 is improved, and the imaging quality of the optical lens 100 is further improved; meanwhile, the constraint of the above relation is beneficial to shortening the total length of the optical lens 100, so that the optical lens 100 achieves the characteristics of light weight and miniaturization. When the ratio is higher than the upper limit, the total length of the optical lens 100 is too long, which is not beneficial to miniaturization of the optical lens 100; when the ratio thereof is below the lower limit, the imaging range of the optical lens 100 is reduced, so that the imaging quality of the optical lens 100 is affected.

In some embodiments, the optical lens 100 satisfies the following relationship:

-4.7<CT3/SAG31<-2.4；

wherein CT3 is the thickness of the third lens element L3 on the optical axis O, i.e., the center thickness of the third lens element L3, SAG31 is the projection of the edge of the optically effective area of the object-side surface 31 of the third lens element L3 on the optical axis O, and the distance between the intersection point of the object-side surface 31 of the third lens element L3 and the optical axis O (i.e., the sagittal height of the object-side surface 31 of the third lens element L3).

By controlling the center thickness of the third lens L3 and the sagittal height of the object side surface 31 of the third lens L3, good conditions can be provided for processing, forming and assembling the third lens L3, the problems of large lens processing difficulty and unstable forming quality caused by overlarge sagittal height of the third lens L3 and the problem of deformation of the assembled lens caused by uneven stress are avoided, and therefore the imaging quality of the optical lens 100 is ensured; when the ratio is higher than the upper limit or lower than the lower limit, the processing of the L3 surface form of the third lens is difficult, and the third lens is easily deformed after assembly, resulting in degradation of imaging quality. Meanwhile, by limiting the center thickness of the third lens L3, the optical lens 100 is made to realize a light and thin design requirement while realizing high imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship:

1.7<TTL/ΣCT<2.15；

wherein, TTL is the distance between the object side surface 11 of the first lens element L1 and the imaging surface 101 on the optical axis O (i.e. the total length of the optical lens assembly 100), Σct is the sum of the thicknesses of the first lens element L1 to the fifth lens element L5 on the optical axis O (i.e. the sum of the thicknesses of the centers of the lens elements of the optical lens assembly 100).

By reasonably controlling the ratio of the total length of the optical lens 100 to the sum of the center thicknesses of the lenses of the optical lens 100, the space of the optical lens 100 can be effectively utilized, and the total length of the optical lens 100 can be reduced, thereby realizing the miniaturized design of the optical lens 100. In addition, when the above relation is satisfied, the tolerance sensitivity can be reduced by increasing the distance between the lenses, so as to improve the quality and stability of the optical lens 100 during production. When the ratio is higher than the upper limit, the total length of the optical lens 100 is too long, which is unfavorable for miniaturization of the optical lens 100; when the ratio thereof is below the lower limit, the sum of the thicknesses of the centers of the lenses of the optical lens 100 is excessively large, the spatial compactness of the optical lens 100 becomes large, the distance between the lenses is limited, and thus, the tolerance sensitivity of the optical lens 100 is affected, so that the imaging quality of the optical lens 100 is degraded.

In some embodiments, the optical lens 100 satisfies the following relationship:

0.8<f/R1-f/R4<1.2；

wherein R1 is a radius of curvature of the object-side surface 11 of the first lens element L1 at the optical axis O, R4 is a radius of curvature of the image-side surface 22 of the second lens element L2 at the optical axis O, and f is an effective focal length of the optical lens assembly 100.

By limiting the relation, the optical lens 100 can have higher aberration correction capability, so that aberration balance of the optical lens 100 is promoted, and further, the resolving power of the optical lens 100 is improved, and the imaging quality of the optical lens 100 is improved; in addition, by controlling the radii of curvature of the first lens L1 and the second lens L2, the manufacturing and molding of the first lens L1 and the second lens L2 are facilitated, and the optical lens 100 can be miniaturized while achieving better manufacturability. When the ratio is higher than the upper limit, the focal length of the optical lens 100 is too large, which is not beneficial to the miniaturization design of the optical lens 100; when the ratio is less than the lower limit, the aberration correcting ability of the optical lens 100 becomes weak, resulting in a decrease in the imaging quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

TTL/tan(HFOV)<4.6mm；

wherein TTL is the distance between the object side surface 11 of the first lens L1 and the imaging surface 101 on the optical axis O, and HFOV is half of the maximum field angle of the optical lens 100.

By reasonably controlling the ratio, the space utilization rate of the whole optical lens 100 is improved, so that the optical lens 100 has the characteristic of large angle of view and simultaneously the miniaturization of the optical lens 100 is ensured. When the ratio is higher than the upper limit, the space utilization of the optical lens 100 is reduced, which is disadvantageous for the miniaturization design of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship:

2.2<(CT1+CT2+CT3)/(CT12+CT23)<4；

wherein, CT1 is the thickness of the first lens element L1 on the optical axis O, i.e., the center thickness of the first lens element L1, CT2 is the thickness of the second lens element L2 on the optical axis O, i.e., the center thickness of the second lens element L2, CT3 is the thickness of the third lens element L3 on the optical axis O, i.e., the center thickness of the third lens element L3, CT12 is the distance from the image side 12 of the first lens element L1 to the object side 21 of the second lens element L2 on the optical axis O, i.e., the air gap between the first lens element L1 and the second lens element L2 on the optical axis O, and CT23 is the distance from the image side 22 of the second lens element L2 to the object side 31 of the third lens element L3, i.e., the air gap between the second lens element L2 and the third lens element L3 on the optical axis O.

By reasonably adjusting the ratio of the sum of the center thicknesses of the first lens L1, the second lens L2 and the third lens L3 to the sum of the air gaps of the first lens L1 and the second lens L2 and the air gaps of the second lens L2 and the third lens L3, the risk of ghost images can be effectively reduced, and the imaging quality of the optical lens 100 can be improved; meanwhile, the above relation is satisfied, which is beneficial to controlling the center thickness of the first lens L1, the second lens L2 and the third lens L3, the air gap of the first lens L1 and the second lens L2, and the air gap of the second lens L2 and the third lens L3, so as to control the total length of the optical lens 100, ensure the compactness of the structure of the optical lens 100, and further realize the miniaturization of the optical lens 100. When the ratio is higher than the upper limit, the risk of ghost images of the optical lens 100 is increased, and the imaging quality of the optical lens 100 is affected; when the ratio is lower than the lower limit, the air gaps of the first lens L1, the second lens L2, and the third lens L3 are excessively large, making it difficult for the optical lens 100 to satisfy the miniaturized design.

In some embodiments, the optical lens 100 satisfies the following relationship:

1.2<SAG42/SAG41<2.9；

the SAG41 is a distance between an edge of the optically effective area of the object-side surface 41 of the fourth lens element L4 and an intersection point of the object-side surface 41 of the fourth lens element L4 and the optical axis O, i.e., a sagittal height of the object-side surface 41 of the fourth lens element L4, and the SAG42 is a distance between an edge of the optically effective area of the image-side surface 42 of the fourth lens element L4 and an intersection point of the image-side surface 42 of the fourth lens element L4 and the optical axis O, i.e., a sagittal height of the image-side surface 42 of the fourth lens element L4.

By the limitation of the relation, the bending degree of the fourth lens L4 is limited, the surface complexity of the fourth lens L4 is reduced, the sensitivity of the optical lens 100 is reduced, the production and processing of the fourth lens L4 are facilitated, and the forming uniformity of the fourth lens L4 is improved; meanwhile, the incident angle of the principal ray is guaranteed, the shooting effect of the incident ray is guaranteed, and the pressure of the fourth lens L4 and the fifth lens L5 on the converging effect of the light ray is reduced, so that the imaging definition of the optical lens 100 is improved, and the imaging quality of the optical lens 100 is improved. When the ratio is higher than the upper limit, the image-side surface 42 of the fourth lens element L4 is excessively high; when the ratio is lower than the lower limit, the object-side surface 41 of the fourth lens element L4 is excessively high, which may lead to a complicated surface profile, and difficulty in lens processing may be increased, so that the imaging quality of the optical lens 100 may be affected.

In some embodiments, the optical lens 100 satisfies the following relationship:

0.6<ET34/SD34<0.95；

the ET34 is a distance between the maximum effective half-caliber of the image side surface 32 of the third lens element L3 and the maximum effective half-caliber of the object side surface 41 of the fourth lens element L4 along the optical axis O, and the SD34 is a difference in height between the maximum effective half-caliber of the image side surface 32 of the third lens element L3 and the maximum effective half-caliber of the object side surface 41 of the fourth lens element L4 perpendicular to the optical axis O.

By limiting the relation, the deflection angle of the light rays emitted from the third lens L3 to the fourth lens L4 is reduced, and the relative illuminance of the external view field is improved, so that the brightness of imaging of the optical lens 100 is improved, and the imaging quality of the optical lens 100 is ensured. Meanwhile, the arrangement compactness of the third lens L3 and the fourth lens L4 can be improved, and the space utilization rate of the optical lens 100 is improved, so that the design requirement of miniaturization of the optical lens 100 is met. When the ratio is higher than the upper limit, the edges of the third lens L3 and the fourth lens L4 are far away from each other, the arrangement of the lenses is loose, the space utilization rate of the optical lens 100 is reduced, and the miniaturization design of the optical lens 100 is not facilitated; when the ratio is lower than the lower limit, the difference between the heights of the edges of the image side surface 32 of the third lens element L3 and the object side surface 41 of the fourth lens element L4 is too large, so that total reflection is likely to occur, resulting in a decrease in the relative illuminance of the external field of view, and further affecting the imaging quality of the optical lens assembly 100.

The object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical, and the surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the conic constant, and Ai is the coefficient corresponding to the ith higher order term in the aspheric surface type formula.

The optical lens 100 of the present embodiment will be described in detail below with reference to specific parameters.

First embodiment

As shown in fig. 1, the optical lens 100 according to the first embodiment of the present application includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be referred to in the above embodiments, and will not be described herein.

Further, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, and the fifth lens element L5 with negative refractive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O.

The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.

Specifically, taking the effective focal length f= 3.195mm of the optical lens 100, the f-number fno=2.1 of the optical lens 100, the field angle fov= 89.899 ° of the optical lens 100, and the total length ttl=4.35 mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, and the surface numbers 2 and 3 correspond to the object side surface and the image side surface of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object side or image side of the corresponding plane number at the optical axis O. The first value in the "thickness" parameter array of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis O. The value of the stop STO in the "thickness" parameter row is the distance between the stop STO and the vertex of the subsequent surface (the vertex refers to the intersection point of the surface and the optical axis O) on the optical axis O, and the direction from the object side surface of the first lens L1 to the image side surface of the last lens is the positive direction of the optical axis O by default. It will be appreciated that the units of Y radius, thickness, and focal length in Table 1 are all mm, and that the refractive index, abbe number in Table 1 is obtained at a reference wavelength of 587.6nm, and that the focal length is obtained at a reference wavelength of 555 nm.

K in table 2 is a conic constant, ai is a coefficient corresponding to the i-th higher order term in the aspherical surface type formula.

TABLE 1

TABLE 2

Referring to fig. 2 (a), fig. 2 (a) shows a longitudinal spherical aberration diagram of the optical lens 100 of the first embodiment at wavelengths of 650.0nm, 610.0nm, 555.0nm, 510.0nm, and 470.0 nm. In fig. 2 (a), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the optical lens 100 in the first embodiment has a better spherical aberration value, which indicates that the optical lens 100 in the present embodiment has a better imaging quality.

Referring to fig. 2 (B), fig. 2 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 555.0nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents focus offset, and the ordinate along the Y-axis direction represents image height in mm. The astigmatic curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S, and it can be seen from fig. 2 (B) that at this wavelength, the astigmatism of the optical lens 100 is well compensated.

Referring to fig. 2 (C), fig. 2 (C) is a graph of distortion of the optical lens 100 at a wavelength of 555.0nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents distortion, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from fig. 2 (C), at this wavelength, the distortion of the optical lens 100 becomes well corrected.

Second embodiment

As shown in fig. 3, a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application, the optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be referred to in the above embodiments, and will not be described herein.

Further, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, and the fifth lens element L5 with negative refractive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave at the paraxial region O.

The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the circumference.

Specifically, taking the effective focal length f= 3.187mm of the optical lens 100, the f-number fno=2.02 of the optical lens 100, the field angle fov= 89.989 ° of the optical lens 100, and the total length ttl= 4.192mm of the optical lens 100 as an example.

Other parameters in the second embodiment are given in table 3 below, and the definition of each parameter can be obtained from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in Table 3 are all mm, and the refractive index and Abbe number in Table 3 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

K in table 4 is a conic constant, ai is a coefficient corresponding to the i-th higher order term in the aspherical surface type formula.

TABLE 3 Table 3

TABLE 4 Table 4

Referring to fig. 4, as shown in fig. 4, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled by the (a) light spherical aberration diagram, the (B) light astigmatism diagram and the (C) distortion diagram, so that the optical lens 100 of the embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in fig. 4 (a), 4 (B) and 4 (C) may refer to the contents described in the first embodiment in fig. 2 (a), 2 (B) and 2 (C), and will not be repeated here.

Third embodiment

As shown in fig. 5, a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application, the optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be referred to in the above embodiments, and will not be described herein.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O.

The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.

Specifically, taking the effective focal length f= 3.179mm of the optical lens 100, the f-number fno=1.90 of the optical lens 100, the field angle fov=90° of the optical lens 100, and the total length ttl= 4.192mm of the optical lens 100 as an example.

Other parameters in the third embodiment are given in table 5 below, and the definition of each parameter can be obtained from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness, and focal length of Y in table 5 are all mm, and the refractive index and abbe number in table 5 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

K in table 6 is a conic constant, ai is a coefficient corresponding to the i-th higher order term in the aspherical surface type formula.

TABLE 5

TABLE 6

Referring to fig. 6, as shown in fig. 6, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled by the (a) light spherical aberration diagram, the (B) light astigmatism diagram and the (C) distortion diagram, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 6 (a), 6 (B) and 6 (C), reference may be made to what is described in the first embodiment with respect to fig. 2 (a), 2 (B) and 2 (C), and the description thereof will be omitted here.

Fourth embodiment

As shown in fig. 7, a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present application, the optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be referred to in the above embodiments, and will not be described herein.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O.

The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave at the circumference.

Specifically, taking the effective focal length f= 3.306mm of the optical lens 100, the f-number fno=2.10 of the optical lens 100, the field angle fov=88° of the optical lens 100, and the total length ttl= 4.350mm of the optical lens 100 as an example.

Other parameters in the fourth embodiment are given in table 7 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 7 are all mm, and the refractive index and abbe number in table 7 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

K in table 8 is a conic constant, ai is a coefficient corresponding to the i-th higher order term in the aspherical surface type formula.

TABLE 7

TABLE 8

Referring to fig. 8, as shown in fig. 8, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled by the (a) light spherical aberration diagram, the (B) light astigmatism diagram and the (C) distortion diagram, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 8 (a), 8 (B) and 8 (C), reference may be made to what is described in the first embodiment with respect to fig. 8 (a), 8 (B) and 8 (C), and the details are not repeated here.

Fifth embodiment

As shown in fig. 9, a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application, the optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be referred to in the above embodiments, and will not be described herein.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, respectively, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O, respectively.

The object-side surface 11 and the image-side surface 12 of the first lens element L1 are concave and convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.

Specifically, taking the effective focal length f= 3.322mm of the optical lens 100, the f-number fno=1.90 of the optical lens 100, the field angle fov= 91.089 ° of the optical lens 100, and the total length ttl= 4.350mm of the optical lens 100 as an example.

Other parameters in the fifth embodiment are given in table 9 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It will be appreciated that the units of Y radius, thickness, and focal length in Table 9 are all mm, and that the refractive index, abbe number in Table 9 is obtained at a reference wavelength of 587.6nm, and that the focal length is obtained at a reference wavelength of 555 nm.

K in table 10 is a conic constant, ai is a coefficient corresponding to the i-th higher order term in the aspherical surface type formula.

TABLE 9

Table 10

/>

Referring to fig. 10, as shown in fig. 10, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled by the (a) light spherical aberration diagram, the (B) light astigmatism diagram and the (C) distortion diagram, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 10 (a), 10 (B) and 10 (C), reference may be made to what is described in the first embodiment with respect to fig. 10 (a), 10 (B) and 10 (C), and the description thereof will be omitted here.

Sixth embodiment

As shown in fig. 11, a schematic structural diagram of an optical lens 100 according to a sixth embodiment of the present application, the optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be referred to in the above embodiments, and will not be described herein.

Further, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, and the fifth lens element L5 with positive refractive power.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave and convex at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O.

The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex and concave at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.

Specifically, taking the effective focal length f= 3.215mm of the optical lens 100, the f-number fno=2 of the optical lens 100, the field angle FOV of the optical lens 100= 90.873 °, and the total length ttl= 4.265mm of the optical lens 100 as an example.

Other parameters in the sixth embodiment are given in table 11 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in table 11 are all mm, and the refractive index and abbe number in table 11 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

K in table 12 is a conic constant, ai is a coefficient corresponding to the i-th higher order term in the aspherical surface type formula.

TABLE 11

Table 12

Referring to fig. 12, as shown in fig. 12, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled by the (a) light spherical aberration diagram, the (B) light astigmatism diagram and the (C) distortion diagram, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 12 (a), 12 (B) and 12 (C), reference may be made to what is described in the first embodiment with respect to fig. 12 (a), 12 (B) and 12 (C), and the description thereof will be omitted here.

Seventh embodiment

As shown in fig. 13, a schematic structural diagram of an optical lens 100 according to a seventh embodiment of the present application, the optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be referred to in the above embodiments, and will not be described herein.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are concave at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O.

Specifically, taking the effective focal length f= 3.309mm of the optical lens 100, the f-number fno=2.10 of the optical lens 100, the field angle FOV of the optical lens 100=89.07°, the total length TTL of the optical lens 100= 4.350mm as an example.

Other parameters in the seventh embodiment are given in table 13 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness and focal length of Y in Table 13 are all mm, and the refractive index and Abbe number in Table 13 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

K in table 14 is a conic constant, ai is a coefficient corresponding to the i-th higher order term in the aspherical surface type formula.

TABLE 13

TABLE 14

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Referring to fig. 14, as shown in fig. 14, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled by the (a) light spherical aberration diagram, the (B) light astigmatism diagram and the (C) distortion diagram, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 14 (a), 14 (B) and 14 (C), reference may be made to what is described in the first embodiment regarding fig. 14 (a), 14 (B) and 14 (C), and the description thereof will be omitted here.

Eighth embodiment

As shown in fig. 15, a schematic structural diagram of an optical lens 100 according to an eighth embodiment of the present application, the optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 60 sequentially disposed from an object side to an image side along an optical axis O. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be referred to in the above embodiments, and will not be described herein.

Further, the object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex and concave at the paraxial region O, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are convex and concave at the paraxial region O, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex at the paraxial region O, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are concave and convex at the paraxial region O, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex and concave at the paraxial region O.

The object-side surface 11 and the image-side surface 12 of the first lens element L1 are convex at the circumference, the object-side surface 21 and the image-side surface 22 of the second lens element L2 are concave at the circumference, the object-side surface 31 and the image-side surface 32 of the third lens element L3 are convex and concave at the circumference, the object-side surface 41 and the image-side surface 42 of the fourth lens element L4 are convex and concave at the circumference, and the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are concave and convex at the circumference.

Specifically, taking the effective focal length f= 3.187mm of the optical lens 100, the f-number fno=2 of the optical lens 100, the field angle FOV of the optical lens 100= 90.86 °, and the total length ttl= 4.268mm of the optical lens 100 as an example.

Other parameters in this eighth embodiment are given in table 15 below, and the definition of each parameter can be derived from the description of the foregoing embodiment, which is not repeated here. It is understood that the units of the radius, thickness, and focal length of Y in table 15 are all mm, and the refractive index and abbe number in table 15 are obtained at a reference wavelength of 587.6nm, and the focal length is obtained at a reference wavelength of 555 nm.

K in table 16 is a conic constant, ai is a coefficient corresponding to the i-th higher order term in the aspherical surface type formula.

TABLE 15

Table 16

Referring to fig. 16, as shown in fig. 16, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled by the (a) light spherical aberration diagram, the (B) light astigmatism diagram and the (C) distortion diagram, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 16 (a), 16 (B) and 16 (C), reference may be made to what is described in the first embodiment with respect to fig. 16 (a), 16 (B) and 16 (C), and the description thereof will be omitted here.

Referring to table 17, table 17 is a summary of the ratios of the relationships in the first to eighth embodiments of the present application.

TABLE 17

Relation/embodiment	First embodiment	Second embodiment	Third embodiment	Fourth embodiment
					0.3<f12/f345<0.75	0.427	0.704	0.510	0.333
1.2＜TTL/ImgH<1.35	1.325	1.277	1.313	1.325
					-4.7<CT3/SAG31<-2.4	-4.360	-2.903	-3.655	-3.117
1.7<TTL/ΣCT<2.15	1.748	2.111	1.906	1.834
					0.8<f/R1-f/R4<1.2	0.806	1.114	0.960	0.916
TTL/tan(HFOV)<4.6 (Unit: mm)	4.358	4.193	4.308	4.505
					2.2<(CT1+CT2+CT3)/(CT12+CT23)<4	3.949	2.331	3.461	3.521
1.2<SAG42/SAG41<2.9	2.755	2.357	2.818	2.430
					0.6<ET34/SD34<0.95	0.601	0.743	0.859	0.653
Relation/embodiment	Fifth embodiment	Sixth embodiment	Seventh embodiment	Eighth embodiment
					0.3<f12/f345<0.75	0.588	0.607	0.347	0.648
1.2＜TTL/ImgH<1.35	1.299	1.273	1.299	1.274
					-4.7<CT3/SAG31<-2.4	-3.645	-3.875	-2.459	-4.626
1.7<TTL/ΣCT<2.15	1.998	1.946	1.962	1.894
					0.8<f/R1-f/R4<1.2	1.102	1.183	0.881	1.167
TTL/tan(HFOV)<4.6 (Unit: mm)	4.268	4.201	4.421	4.204
					2.2<(CT1+CT2+CT3)/(CT12+CT23)<4	3.267	2.266	3.154	2.533
1.2<SAG42/SAG41<2.9	2.634	1.272	2.269	1.463
					0.6<ET34/SD34<0.95	0.902	0.730	0.734	0.699

Referring to fig. 17, the present application further discloses an image capturing module 200, which includes an image sensor 201 and the optical lens 100 according to any one of the first to eighth embodiments, wherein the image sensor 201 is disposed on an image side of the optical lens 100. The optical lens 100 is configured to receive an optical signal of a subject and project the optical signal to the image sensor 201, and the image sensor 201 is configured to convert the optical signal corresponding to the subject into an image signal, which is not described herein. It can be appreciated that the image capturing module 200 having the optical lens 100 described above can achieve a high-quality imaging effect while satisfying a compact and lightweight design. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.

Referring to fig. 18, the application further discloses an electronic device 300, where the electronic device 300 includes a housing 301 and the above-mentioned camera module 200, and the camera module 200 is disposed in the housing 301. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, a vehicle recorder, a back image, etc. It can be appreciated that the electronic device 300 having the image capturing module 200 also has all the technical effects of the optical lens 100. That is, while satisfying the miniaturization design, a high-quality imaging effect can be achieved. Since the above technical effects are described in detail in the embodiment of the optical lens 100, the description thereof is omitted here.

The optical lens, the camera module and the electronic device disclosed in the embodiments of the present application are described in detail, and specific examples are applied to the description of the principles and the implementation modes of the present application, and the description of the above embodiments is only used to help understand the optical lens, the camera module, the electronic device and the core ideas thereof; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present application, the present disclosure should not be construed as limiting the present application in summary.

Claims

1. An optical lens element, comprising five lens elements with refractive power, in order from an object side to an image side along an optical axis:

a third lens element with refractive power;

the optical lens satisfies the following relation:

0.3<f12/f345<0.75；

-4.7<CT3/SAG31<-2.4；

wherein f12 is a combined focal length of the first lens element and the second lens element, f345 is a combined focal length of the third lens element, the fourth lens element and the fifth lens element, CT3 is a thickness of the third lens element on the optical axis, and SAG31 is an object-side sagittal height of the third lens element.

2. The optical lens of claim 1, wherein the optical lens satisfies the relationship:

1.2＜TTL/ImgH<1.35；

Wherein TTL is a distance between an object side surface of the first lens and an imaging surface of the optical lens on the optical axis, and ImgH is a radius of a maximum effective imaging circle of the optical lens.

3. The optical lens of claim 1, wherein the optical lens satisfies the relationship:

1.7<TTL/ΣCT<2.15；

wherein TTL is the distance from the object side surface of the first lens element to the imaging surface of the optical lens element on the optical axis, Σct is the sum of the thicknesses of the first lens element to the fifth lens element on the optical axis.

4. The optical lens of claim 1, wherein the optical lens satisfies the relationship:

0.8<f/R1-f/R4<1.2；

5. The optical lens of claim 1, wherein the optical lens satisfies the relationship:

TTL/tan(HFOV)<4.6mm；

6. The optical lens of claim 1, wherein the optical lens satisfies the relationship:

2.2<(CT1+CT2+CT3)/(CT12+CT23)<4；

Wherein, CT1 is the thickness of the first lens element on the optical axis, CT2 is the thickness of the second lens element on the optical axis, CT3 is the thickness of the third lens element on the optical axis, CT12 is the distance from the image side surface of the first lens element to the object side surface of the second lens element on the optical axis, and CT23 is the distance from the image side surface of the second lens element to the object side surface of the third lens element on the optical axis.

7. The optical lens of claim 1, wherein the optical lens satisfies the relationship:

1.2<SAG42/SAG41<2.9；

wherein SAG41 is the distance between the intersection point of the object-side surface of the fourth lens and the optical axis, and SAG42 is the image-side surface sagittal height of the fourth lens.

8. The optical lens of claim 1, wherein the optical lens satisfies the relationship:

0.6<ET34/SD34<0.95；

9. A camera module, its characterized in that: the camera module comprises an image sensor and the optical lens as claimed in any one of claims 1 to 8, wherein the image sensor is arranged on the image side of the optical lens.

10. An electronic device, characterized in that: the electronic device comprises a shell and the camera module set according to claim 9, wherein the camera module set is arranged on the shell.